Source files in use or modified while transfer

Carlos Carvalho carlos at
Thu Jun 3 16:27:04 MDT 2010

HomeRun4711 (homerun4711 at wrote on 3 June 2010 11:27:
 >I have a question on rsync's way to deal with files in use
 >or files that are modified on the source while they
 >are transferrred to the destination.
 >But what if e.g. a large mailbox file is changed on the source directory.

In the source the file is read only once. Changes that happen during
the transfer ahead of the point where rsync is reading are
transmitted, changes before that position are not.

 >Is there a checksum check after the transfer and if yes - how often
 >is the file transferred again by default.

The checksum is applied to what's been transmitted. There's no
re-reading of the file at either end.

 >Is rsync working with a shadow copy of the source files?


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